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The Variable High-Velocity Outflows Seen in X-Ray Spectra

Published online by Cambridge University Press:  03 June 2010

Shai Kaspi
Shai Kaspi*
Affiliation:
Physics Department, Technion, Haifa 32000, Israel and School of Physics & Astronomy and the Wise ObservatoryThe Raymond and Beverly Sackler Faculty of Exact SciencesTel-Aviv University, Tel-Aviv 69978, Israel Email: [email protected]
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Abstract

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Several AGNs have been reported to have ultra-high velocity (UHV) outflows (of order 0.3 ≳ ν/c ≳ 0.05) that are detected in their X-ray spectrum. Re-visiting these outflow observations reveal that the spectrum has changed along with the claimed outflows. The luminous quasar PDS 456 is the brightest AGN in which a UHV outflow has been claimed to be present in its grating spectrum. We report on an XMM–Newton observation of this source, as well as analysis of past observations, which reveal its variable nature and the variable nature of UHV outflows. In this object, as well as in a few others, repeated observations failed to reproduce the previous absorption spectra. This indicates that variability is common among the UHV winds. A discussion of the reality, significance, and the interpretation of the UHV outflow phenomenon is presented. If UHV outflows exist, they might be a transiting phenomenon, as indicated from repeated observations, and this has to be taken into account when studying the influence of these outflows on the surrounding galaxy.

Keywords

galaxies: activegalaxies: nucleiquasars: absorption linesX-rays: galaxies
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S267: Co-Evolution of Central Black Holes and Galaxies , August 2009 , pp. 370 - 376
Copyright
Copyright © International Astronomical Union 2010

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